package com.atguigu.springcloud.alibaba.controller;


import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.atguigu.springcloud.alibaba.service.PaymentService;
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

@RestController
@Slf4j
public class CircleBreakerController {


    public static final String SERVER_URL = "http://nacos-payment-provider";


    @Resource
    private RestTemplate restTemplate;

    @Resource
    private PaymentService paymentService;


    @RequestMapping("/consumer/fallback/{id}")
//    @SentinelResource(value = "fallback")   // 无配置，给用户返回错误页面不友好
//    @SentinelResource(value = "fallback",fallback = "handlerFallback") // 只配置fallback，fallback管运行异常
//    @SentinelResource(value = "fallback",blockHandler = "blockHandler") //blockHandler只负责sentinel控制台配置违规
    // 若blockHandler和fallback 都进行了配置，则被限流降级而抛出BlockException时只会进入blockHandler处理逻辑。
    @SentinelResource(value = "fallback",
            fallback = "handlerFallback",
            blockHandler = "blockHandler",
            // exceptionsToIgnore，忽略指定异常，即这些异常不用兜底方法处理。
            exceptionsToIgnore = IllegalArgumentException.class)
    public CommonResult<Payment> fallback(@PathVariable Long id){
        CommonResult<Payment> result = restTemplate.getForObject(SERVER_URL + "/paymentSQL/" + id, CommonResult.class, id);

        if(id == 4){
            throw new IllegalArgumentException("IllegalArgumentException,非法参数异常....");
        }else if(result.getData() == null){
            throw new NullPointerException("NullPointerException,该ID没有对应记录,空指针异常");
        }
        return result;
    }

    //本例是fallback
    public CommonResult handlerFallback(@PathVariable  Long id,Throwable e) {
        Payment payment = new Payment(id,"null");
        return new CommonResult<>(444,"兜底异常handlerFallback,exception内容  "+e.getMessage(),payment);
    }

    //本例是blockHandler
    public CommonResult blockHandler(@PathVariable  Long id, BlockException blockException) {
        Payment payment = new Payment(id,"null");
        return new CommonResult<>(445,"blockHandler-sentinel限流,无此流水: blockException  "+blockException.getMessage(),payment);
    }




    @GetMapping("consumer/paymentSQL/{id}")
    public CommonResult paymentSql(@PathVariable Long id){
        return paymentService.paymentSQL(id);
    }


}
